data_global _chemical_name_mineral 'Muscovite' loop_ _publ_author_name 'Comodi P' 'Zanazzi P F' _journal_name_full 'Physics and Chemistry of Minerals' _journal_volume 22 _journal_year 1995 _journal_page_first 170 _journal_page_last 177 _publ_section_title ; High-pressure structural study of muscovite Sample: K-Ms, P = 2.80 GPa ; _database_code_amcsd 0007909 _chemical_formula_sum 'K.9 Na.07 Ba.01 Al2.8 Ti.04 Fe.08 Mg.04 Si3.04 O12 H2' _cell_length_a 5.151 _cell_length_b 8.931 _cell_length_c 19.399 _cell_angle_alpha 90 _cell_angle_beta 95.8 _cell_angle_gamma 90 _cell_volume 887.855 _exptl_crystal_density_diffrn 2.996 _symmetry_space_group_name_H-M 'C 1 2/c 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,z' 'x,-y,1/2+z' '1/2+x,1/2-y,1/2+z' '-x,y,1/2-z' '1/2-x,1/2+y,1/2-z' '-x,-y,-z' '1/2-x,1/2-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy _atom_site_U_iso_or_equiv K 0.00000 0.09660 0.25000 0.90000 0.01710 Na 0.00000 0.09660 0.25000 0.07000 0.01710 Ba 0.00000 0.09660 0.25000 0.01000 0.01710 AlM2 0.24850 0.08300 0.00010 0.92000 0.00830 TiM2 0.24850 0.08300 0.00010 0.02000 0.00830 FeM2 0.24850 0.08300 0.00010 0.04000 0.00830 MgM2 0.24850 0.08300 0.00010 0.02000 0.00830 SiT1 0.96760 0.42790 0.13940 0.76000 0.00730 AlT1 0.96760 0.42790 0.13940 0.24000 0.00730 SiT2 0.45240 0.25730 0.13920 0.76000 0.00870 AlT2 0.45240 0.25730 0.13920 0.24000 0.00870 O1 0.96130 0.44060 0.05250 1.00000 0.00650 O2 0.38680 0.25100 0.05330 1.00000 0.00570 O3 0.41080 0.09200 0.17060 1.00000 0.01730 O4 0.75620 0.30410 0.16140 1.00000 0.01780 O5 0.25460 0.37180 0.17450 1.00000 0.01330 O-h 0.95850 0.06220 0.05330 1.00000 0.00960 H 0.34000 0.36300 0.54800 1.00000 0.20000